Apple has released the iOS 4.2.1 IPSW (final version) for iPhone, iPod Touch and iPad and is available for download. The iOS 4.2.1 firmware comes up with new features like AirTunes, Wireless printing, AirPlay, new folder features and more. The main specialty is that iOS 4.2.1 supports iPad also so that iPad users can also enjoy the same features experienced by iPhone and iPod Touch users.

Download iOS 4.2 IPSW

You could update your iPhone 3G/3GS/4 or iPod Touch 2G/3G to iOS 4.2.1 using iTunes. You could download iOS 4.2.1 IPSW files from the below given direct download links by Apple.

iPhone 3G

iPhone 3GS

iPhone 4

iPod Touch 2G

iPod Touch 3G

iPod Touch 4G

iPad

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